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  • int datatype in 64bit JVM. Is it more "inefficient" than long?

    - by Zwei Steinen
    I heard that using shorts on 32bit system is just more inefficient than using ints. Is this the same for ints on a 64bit system? Python recently(?) basically merged ints with long and has basically a single datatype long, right? If you are sure that your app. will only run on 64bit then, is it even conceivable (potentially a good idea) to use long for everything in Java?

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  • Performance, serve all CSS at once, or as its needed?

    - by yaya3
    As far as I know, these days there are two main techniques used for including CSS in a website. A) Provide all the CSS used by the website in one (compressed) file B) Provide the CSS for required by the elements on the page that is currently being viewed only Positives for A: The entire CSS used on the site is cached on first visit via 1 http request Negatives for A: if it's a big file, it will take a long time to load initially Positives for B: Faster initial load time Negatives for B: More HTTP requests, more files to cache Is there anything (fundamental) that I am missing here?

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  • Java for a C programmer?

    - by Brian
    Hi, I have a lot of experience in C and Python, but I'd like to pick up some Java. I was curious if there was a "quick and dirty" guide tailored for people with previous CS background. I'd prefer free online resources but appreciate any suggestion. Thanks, Brian

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  • php connecting to mysql server(localhost) very slow

    - by Ahmad
    actually its little complicated: summary: the connection to DB is very slow. the page rendering takes around 10 seconds but the last statement on the page is an echo and i can see its output while the page is loading in firefox (IE is same). in google chrome the output becomes visible only when the loading finishes. loading time is approximately the same across browsers. on debugging i found out that its the DB connectivity that is creating problem. the DB was on another machine. to debug further. i deployed the DB on my local machine .. so now the DB connection is at 127.0.0.1 but the connectivity still takes long time. this means that the issue is with APACHE/PHP and not with mysql. but then i deployed my code on another machine which connects to DB remotely.and everything seems fine. basically the application uses couple of mod_rewrite.. but i removed all the .htaccess files and the slow connectivity issue remains.. i installed another APACHE on my machine and used default settings. the connection was still very slow. i added following statements to measure the execution time $stime = microtime(); $stime = explode(" ",$stime); $stime = $stime[1] + $stime[0]; // my code -- it involves connection to DB $mtime = microtime(); $mtime = explode(" ",$mtime); $mtime = $mtime[1] + $mtime[0]; $totaltime = ($mtime - $stime); echo $totaltime; the output is 0.0631899833679 but firebug Net panel shows total loading time of 10-11 seconds. same is the case with google chrome i tried to turn off windows firewall.. connectivity is still slow and i just can't quite find the reason.. i've tried multiple DB servers.. multiple apaches.. nothing seems to be working.. any idea of what might be the problem?

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  • stop execution of process for miliseconds.

    - by Viral
    hi friends, I m creating a Tic tac toe game, in that after click made by user automatically the cpu will respond. I want the cpu response after 0.50 seconds, the sleep() function takes too many time, i don't want that much time, is there any other way to do so???

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  • how to work with datagridview if need show many columns data (approx 1Mio)

    - by ruprog
    is a problem to display data in Datagridview. A large amount of data (stock quotes) data to be displayed from left to right Tell me what to do to display an array of data in datagridviev Public dat As New List(Of act) Public Class act Public time As Date Public price As Integer End Class Sub work() Dim r As New Random For x As Integer = 0 To 1000000 Dim el As New act el.time = Now el.price = r.Next(0, 1000) dat.Add(New act) Next End Sub

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  • Easy way to convert regex to a java compatible regex?

    - by beagleguy
    hi all I have a regex defined in python/ruby/php that is like this "(forumdisplay.php\?.*page=%CURRENTPAGE%)" when I do it for java, I have to double escape that question mark to //? like so: "(forumdisplay.php\\?.*page=%CURRENTPAGE%)"; is there a function I can use to do that automatically? or would I need to change all my regexes over to work with the java regex engine? thanks

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  • How to use HTTP method DELETE on Google App Engine?

    - by Jader Dias
    I can use this verb in the Python Windows SDK. But not in production. Why? What am I doing wrong? The error message includes (only seen via firebug or fiddler) Malformed request or something like that My code looks like: from google.appengine.ext import db from google.appengine.ext import webapp class Handler(webapp.RequestHandler): def delete(self): key = self.request.get('key') item = db.get(key) item.delete() self.response.out.write(key)

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  • How to disambiguate a sequence in sql?

    - by Martin
    I have a table of data which represents a series of events that persons do over time, sometimes people do the same thing several times in a row. How to select a result using MS SQL 2008 that shows only disambiguated sequences of those events? Source data: Person Event Time 1 2 1 1 2 20 1 2 33 2 1 34 1 4 43 1 2 44 2 3 45 1 2 46 1 3 50 1 3 55 Result: Person Event 1 2 2 1 1 4 1 2 2 3 1 3

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  • Trobleshooting extremely slow opening times in Win7 for documents on Win2k8 server

    - by Mazupan
    Hello. It's hard even to describe my problem. It seems there's only problem with extreme slow openings (up to 10 minutes) on Windows 7 (on XP things works fine) for files that are stored on Windows Server 2008. And now what I discovered up till now. If I open (some files, not all, not allways) .doc and .xls files with doubleclicking it takes up to 10 minutes to finaly open the file. In that time, file seems to be locked for all other users. If I cancel opening, file remains locked for some time. Owner on that files is the one who last wrote changes in them. If I change the owner to larger group, which I am member of file gets opened super fast. When opened file can be saved normaly and fast. That file reopens fast. One other user reports that there is only problem when opening the files for the first time in a day. When he openes first file he has no problems with other files at all (or so he says). He also states that when accessing files from home via VPN he has no such problems with files. And now: anybody has a clue where to start looking? I suppose that is misconfiguration problem. But where? File system? Permissions? DFS? VMWare network config? My setup is as follows: Physical server: HP Prolian ML350 G6 Virtual host: VMWare ESXi 4 Guest: Windows Server 2008 Standard Files are accessed via DFS shares. Please help me. Thanks. Mazupan

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  • Load is 0, yet site crawls (sometimes). What gives?

    - by Yegor
    I have a ~1.5-2mil page views per day site running on 2 servers. One for mysql, other for everything else. Mysql box has a load of 3, frontend is usually 0.0-0.1. Both are dual quad core with 8GB ram running SAS drives in raid5. CPU is idle for majority of the time, iowait is non-existent. Im running nginx, memcache, and site is built on php. Half the time everything runs perfect, while at other times it lags something severe, when it takes 10-15 seconds for a page to load. Page execution time is always super low, but it seems to hang, waiting for something before it actually loads the page. Whats even more weird is that it only happens to 1 file on the site (but its the one thats most commonly accessed, that actually loads the content on the site). Other pages are super fast at all times, even when it takes 15 seconds to load actual content. I have nginx_stats plugin installed, and if I monitor it, the lag spikes happen when the write column starts going above 100, and it frequently does... all the way to 500-1000. It does so at totally random times... not when traffic is heavy... it can do this in the middle of the night, and work perfectly at 5pm when traffic is at its highest. Any ideas?

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  • How to test an openshift application on local host

    - by panipsilos
    I recently start playing with Openshift and I am wondering if there is a way to deploy ( test) your application on local host before you upload it on openshift. Thing is that every time I make change on the code, it takes some time to push it to openshift and check if it works. Google app engine SDK ( for Eclipse), for example, includes a web server application (app engine simulator) that allows you to test your app locally before you deploy on google. thnx Fotis

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  • What is an overloaded operator in c++?

    - by Jeff
    I realize this is a basic question but I have searched online, been to cplusplus.com, read through my book, and I can't seem to grasp the concept of overloaded operators. A specific example from cplusplus.com is: // vectors: overloading operators example #include <iostream> using namespace std; class CVector { public: int x,y; CVector () {}; CVector (int,int); CVector operator + (CVector); }; CVector::CVector (int a, int b) { x = a; y = b; } CVector CVector::operator+ (CVector param) { CVector temp; temp.x = x + param.x; temp.y = y + param.y; return (temp); } int main () { CVector a (3,1); CVector b (1,2); CVector c; c = a + b; cout << c.x << "," << c.y; return 0; } from http://www.cplusplus.com/doc/tutorial/classes2/ but reading through it I'm still not understanding them at all. I just need a basic example of the point of the overloaded operator (which I assume is the "CVector CVector::operator+ (CVector param)"). There's also this example from wikipedia: Time operator+(const Time& lhs, const Time& rhs) { Time temp = lhs; temp.seconds += rhs.seconds; if (temp.seconds >= 60) { temp.seconds -= 60; temp.minutes++; } temp.minutes += rhs.minutes; if (temp.minutes >= 60) { temp.minutes -= 60; temp.hours++; } temp.hours += rhs.hours; return temp; } from "http://en.wikipedia.org/wiki/Operator_overloading" The current assignment I'm working on I need to overload a ++ and a -- operator. Thanks in advance for the information and sorry about the somewhat vague question, unfortunately I'm just not sure on it at all.

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  • Office 2010 Trust Center settings: How to enable data connections in the "old" way?

    - by GSerg
    We're planning an upgrade Office 2003 - 2010 and have identified a big problem. In Office 2003, if the workbook you're opening contains a query table that fetches data from a data source automatically (upon file open or in certain intervals), then a security dialog pops up - whether you want to allow that. If you say Yes, the queries will refresh automatically when they need to. If you say No, the queries will not refresh automatically, neither on file open nor on time intervals, but you will be able to refresh any of them manually at any time by right-clicking and selecting Refresh. There is also a registry parameter to say, Don't display that dialog, just allow the queries. This is exactly what we want. On users' computers we have the registry parameter applied, so the users never see any dialogs. On developers' computers the parameter is not applied, so every time a file is opened the developer decides whether to allow the auto-refreshing for the current session. Usually the answer is No, because for developing, it is essential to not have quieres refresh when they want to, but instead, refresh them when the developer wants. The problem is that in Office 2010 which we are testing we can't find a way to achieve this functionality: The allow/disallow messages are now grouped into one yellow button, that either allows everything or disallows everything (including, say, macros, if macro security is set to "Disable, but ask"). If you don't click the yellow Allow button, the queries are disabled completely, not just for automatic execution. You cannot right-click and refresh a particular query -- doing that would summon a security dialog prompting for enabling queries, and if you say Yes, all queries in the document will be enabled for auto-execution and will start executing immediately. This sort of ruins our development environment. Is there a way to get the trust thingies in Office 2010 to work in the same way as before? Is there a yet another registry parameter to say, Prompt for auto-refresh, but allow manual refresh even when auto-refresh is disabled?

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  • How to avoid fast rate page refresh in ASP.NET ?

    - by eugeneK
    I have a page that shows statistics for users, this cannot be cached because each user has different statistics and there are many thus the real time query must be made. What the way to avoid database server overload when user will click F5's to refresh or to ask different queries in short time intervals ?

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  • sum of Times in SQL

    - by LIX
    Hello all, I have some records like this: ID Personel_Code Time --- ------------- ------ 1 0011 05:50 3 0011 20:12 4 0012 00:50 I want to have the sum of times for each person. in this example I want to have the result like this : Personel_Code Time ------------- ----- 0011 26:02 0012 00:50 Thank you.

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  • Random keyboard malfunction - happens in Vista and XP

    - by Stupefy101
    For some weird reason, some of my keyboard keys of my deskop are acting very strangely. I don't remember a certain time when it started and I can't recognize any pattern as to when it happens and when it doesn't. The problem occurs in Windows XP, XP Safe Mode, Vista, and Vista Safe mode (I have a dual boot system) Here's what's happening: When I push the I, K, comma, or 8 keys (notice how they are all in the same column), instead of just getting that character, I get extra characters afterwards. For example, I'll push the k key and it will print "ksfda", pushing "I" gives me "IWREQ", comma gives me ", xvcz", pushing 8 gives me "82431". There are a couple things that I have noticed: It does not happen every time I push the key It happens in all OS and applications I have tested The characters coming after the desired ones are in the same pattern (column order: 2, 4, 3, 1 from the left of the keyboard in the same row as the key pressed. Pressing "]" will sometimes give me "]t", and if done in Notepad, will bring up the "Find" dialog window I cannot seem to remember a specific time the problem started, although I have been defragging, using TuneUp Utilities + CCleaner, and installing lots of new programs lately.

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  • How to download file into string with progress callback?

    - by Kaminari
    I would like to use the WebClient (or there is another better option?) but there is a problem. I understand that opening up the stream takes some time and this can not be avoided. However, reading it takes a strangely much more amount of time compared to read it entirely immediately. Is there a best way to do this? I mean two ways, to string and to file. Progress is my own delegate and it's working good. FIFTH UPDATE: Finally, I managed to do it. In the meantime I checked out some solutions what made me realize that the problem lies elsewhere. I've tested custom WebResponse and WebRequest objects, library libCURL.NET and even Sockets. The difference in time was gzip compression. Compressed stream lenght was simply half the normal stream lenght and thus download time was less than 3 seconds with the browser. I put some code if someone will want to know how i solved this: (some headers are not needed) public static string DownloadString(string URL) { WebClient client = new WebClient(); client.Headers["User-Agent"] = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1045 Safari/532.5"; client.Headers["Accept"] = "application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"; client.Headers["Accept-Encoding"] = "gzip,deflate,sdch"; client.Headers["Accept-Charset"] = "ISO-8859-2,utf-8;q=0.7,*;q=0.3"; Stream inputStream = client.OpenRead(new Uri(URL)); MemoryStream memoryStream = new MemoryStream(); const int size = 32 * 4096; byte[] buffer = new byte[size]; if (client.ResponseHeaders["Content-Encoding"] == "gzip") { inputStream = new GZipStream(inputStream, CompressionMode.Decompress); } int count = 0; do { count = inputStream.Read(buffer, 0, size); if (count > 0) { memoryStream.Write(buffer, 0, count); } } while (count > 0); string result = Encoding.Default.GetString(memoryStream.ToArray()); memoryStream.Close(); inputStream.Close(); return result; } I think that asyncro functions will be almost the same. But i will simply use another thread to fire this function. I dont need percise progress indication.

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  • HttpService Vs Remote Objects

    - by kalyaniRavi
    Hi, I have a flex application and need to show the real time data into the chatrs and datagrids. Eralier we are used Httpservices to showing the real time data and historical data into charts and datagrids. But now we are going to replace the Httpservices to remote objects. So which places generally need to change. I have a little bit idea about remote objects. Thanks, Ravi

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  • C++ priority queue structure used ?

    - by John Retallack
    While searching for some functions in C++ STL documentation I read that push and pop for priority queues needs constant time. "Constant (in the priority_queue). Although notice that push_heap operates in logarithmic time." My question is what kind of data structure is used to mantain a priority queue with O(1) for push and pop ?

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  • Creating a Web Service to automatically get information

    - by Sean P
    I want to create some sort of method of creating a web service that will run automatically and run DB queries and some API calls which will then store data that I can use/call without taking the processing or time penalty of doing it every time a user access my web service. Is this possible? If so, point me in the right direction on how to implement something like this Using vb.net and ASP.net Thanks in advance!!

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  • host an asp.net webite outside of IIS

    - by boraer
    Hi everybody, I need to write an asp.net application which have to handle very large amount of data per second. Probably max5000 user may transact in same time. I think I will use WCF in back to communicate SQL server. But in front ISS can handle 5000 user in same time effectively or is there any simple way to host my application outside of IIS

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